[9] CL-USER(38): (load (compile-file "sys:gtk;loadgtk20.cl"))
;;; Compiling file sys:gtk;loadgtk20.cl
;;;   (/Applications/AllegroCL/gtk/loadgtk20.cl)
;;; Writing fasl file sys:gtk;loadgtk20.fasl
;;;   (/Applications/AllegroCL/gtk/loadgtk20.fasl)
;;; Fasl write complete
; Fast loading /Applications/AllegroCL/gtk/loadgtk20.fasl
;   Loading /Applications/AllegroCL/gtk/gtk20-lib.so
Possible Error Cause: Lisp needs to be started with the LD_LIBRARY_PATH
                      environment variable including the gtk library
                      path.
Error: Can't have unescaped whitespace in token. [file position = 23]
  [condition type: READER-ERROR]

Restart actions (select using :continue):
  0: retry the load of gtk:gtk20-lib.so
  1: skip loading gtk:gtk20-lib.so
  2: Build gtk:gtk20-lib.so
  3: retry the load of /Applications/AllegroCL/gtk/loadgtk20.fasl
  4: skip loading /Applications/AllegroCL/gtk/loadgtk20.fasl
  5: recompile /Applications/AllegroCL/gtk/loadgtk20.cl
  6: Return to Debug Level 9 (an "abort" restart).
  7: Return to Debug Level 8 (an "abort" restart).
  8: retry the compilation of /Users/Francois/Documents/UTC/IA01/deriv.cl
  9: continue compiling /Users/Francois/Documents/UTC/IA01/deriv.cl but
     generate no output file
 10: Return to Debug Level 7 (an "abort" restart).
 11: Return to Debug Level 6 (an "abort" restart).
 12: Return to Debug Level 5 (an "abort" restart).
 13: Return to Debug Level 4 (an "abort" restart).
 14: Return to Debug Level 3 (an "abort" restart).
 15: Return to Debug Level 2 (an "abort" restart).
 16: Return to Debug Level 1 (an "abort" restart).
 17: continue computation
 18: Return to Top Level (an "abort" restart).
 19: Abort entirely from this (lisp) process.

[changing package from "COMMON-LISP-USER" to "EXCL"]